Bending die for automobile support

Abstract

The invention relates to a bending die for an automobile support, and relates to the field of bending dies, the bending die comprises a lower supporting die, an upper pressing die, a supporting piece with a supporting seat and a buffering assembly, and a pressing groove used for allowing the lower supporting die to be inserted in is formed in the side, close to the lower supporting die, of the upper pressing die; the supporting base is located on the side, away from the upper pressing die, of the lower supporting die. The buffer assembly comprises a first telescopic rod and a first compression spring; one end of the first telescopic rod is connected with the lower supporting mold, and the other end of the first telescopic rod is connected with the supporting seat; one end of the first compression spring is connected with the lower supporting die, the other end of the first compression spring is connected with the supporting seat, and the telescopic direction of the first telescopic rod and the telescopic direction of the first compression spring are both parallel to the first direction X; the upper pressing die, the lower supporting die and the supporting base are sequentially distributed in the first direction X. The method has the effect of reducing damage to original stent parts so as to improve the quality of the stent.

Description

Technical Field

[0001] The present application relates to the field of bending dies, and in particular to a bending die for an automobile bracket. Background Art

[0002] There are many types of automobile brackets. One type of bracket original part 01 is in the shape of a long strip, and its cross section is concave, and outer flanges 011 are formed on both sides of the concave opening. When the bracket original part 01 is further processed, the bracket original part 01 needs to be bent as follows Figure 1 The shape shown; The bending mold currently used includes an upper mold and a lower mold. When in use, the bracket original 01 is moved so that the concave opening of the bracket original 01 passes through the top of the lower mold so that the bracket original 01 overlaps the top of the lower mold; a groove that matches the lower mold is opened at the bottom of the upper mold. When the upper mold is moved downward, the bending mold can be bent.

[0003] However, when the above-mentioned bending mold is used, since the upper mold is usually driven by a hydraulic cylinder to press downward quickly to achieve bending, the instantaneous impact force is too large, which can easily cause damage to the bracket original 01, resulting in poor bracket quality. Summary of the invention

[0004] In order to reduce the damage to the original bracket and improve the quality of the bracket, the present application provides a bending mold for an automobile bracket.

[0005] The present application provides a bending die for an automobile bracket adopts the following technical solution: A bending die for an automobile bracket, comprising: Lower formwork; An upper pressing die, wherein a pressing groove for inserting the lower supporting die is formed on one side of the upper pressing die close to the lower supporting die; A support member having a support seat, wherein the support seat is located on a side of the lower support mold away from the upper pressing mold; and A buffer assembly, the buffer assembly comprising a first telescopic rod and a first compression spring; one end of the first telescopic rod is connected to the lower support mold, and the other end is connected to the support seat; one end of the first compression spring is connected to the lower support mold, and the other end is connected to the support seat, and the telescopic direction of the first telescopic rod and the telescopic direction of the first compression spring are both parallel to the first direction X; The upper pressing die, the lower supporting die and the supporting seat are distributed in sequence in the first direction X.

[0006] By adopting the above technical solution, during operation, the bracket original part is overlapped on the lower supporting formwork, and when the hydraulic cylinder is used to drive the lower pressure die to impact downward, the first compression spring can cushion the lower supporting formwork and the bracket original part overlapped on the lower supporting formwork, so as to dissipate the instantaneous impact force through the first compression spring, reduce the damage to the bracket original part, and improve the quality of the bracket original part; and the setting of the first telescopic rod can guide the movement of the lower supporting formwork, so as to reduce the situation where the bracket original part cannot be inserted into the pressing groove of the upper pressure die due to the offset of the lower supporting formwork.

[0007] Optionally, the support member further comprises two supporting inclined side plates fixedly connected to the support member; The two supporting inclined side plates are spaced apart in the second direction Y, so that the two supporting inclined side plates form a workpiece placement area for accommodating the lower formwork in the second direction Y; The distance between the two supporting oblique side plates in the second direction Y gradually increases toward the side away from the supporting seat; In the second direction Y, an avoidance gap is formed between the side of the supporting inclined side plate close to the lower supporting formwork and the lower supporting formwork, and the avoidance gap is used to accommodate the outer flange of the bracket original.

[0008] By adopting the above technical solution, the outer flange can be accommodated by reserving an avoidance gap, and when the outer flange contacts the supporting inclined side plate, the outer flange can be prevented from expanding and deforming outwards during the bending process.

[0009] Optionally, a support platform is also included; The support platform is slidably connected to the support oblique side plate along a first direction X; The lower supporting formwork is located at a side of the supporting platform away from the supporting seat, and the lower supporting formwork is detachably connected to the supporting platform; The supporting inclined side plate is used to block the side of the avoidance gap close to the supporting seat, so that the supporting platform is used to overlap the outer flange of the bracket original; The buffer assembly is connected between the support platform and the support seat.

[0010] By adopting the above technical solution, by detachably connecting the lower supporting mold to the supporting platform, different types of bracket originals can be adapted by replacing different types of lower supporting molds, which can improve the versatility of the mold.

[0011] Optionally, a side of each of the supporting inclined side plates close to another supporting inclined side plate can be detachably connected to a limiting block; The limit block is located on a side of the support platform close to the support seat. When the support platform contacts the limit block, the first compression spring is in a compressed state in which the deformation can be restored.

[0012] By adopting the above technical solution and setting a limit block, it is possible to prevent the support platform from pressing the first compression spring to an elastic failure state, which can protect the first compression spring.

[0013] Optionally, a slide groove is formed through the supporting oblique side plate along the second direction Y, and a sliding bar passing through the slide groove is fixedly connected to the supporting platform, and a groove wall of the slide groove is used to guide the sliding bar to slide along the first direction X.

[0014] By adopting the above technical solution and providing the sliding groove and the sliding bar, the sliding of the support platform along the first direction X can be guided to prevent the support platform from moving in the third direction Z.

[0015] Optionally, the support seat includes: a linear driving member, wherein the driving direction of the linear driving member is parallel to the second direction Y; and Two support plates, each end of the linear drive member is connected to one of the support plates, so that the two support plates can move relative to each other in the second direction Y; Each of the supporting inclined side plates is fixedly connected to one of the supporting plates.

[0016] By adopting the above technical solution and setting a linear drive component, the distance between the two supporting oblique side plates can be changed to adapt to different models of bracket components; in addition, by using a linear drive component to increase the distance between the two supporting oblique side plates, the bracket component can be expanded within an allowable range during the bending process of the bracket component.

[0017] Optionally, the buffer component further includes: Two end plates, the two end plates are spaced apart in the first direction X, the first compression spring and the first telescopic rod are fixedly connected between the two end plates; one of the two end plates is end plate 1, and the other is end plate 2; The first end plate is slidably connected to one of the support platform and the support plate along the first direction X, and the second end plate is fixedly connected to the other.

[0018] By adopting the above technical solution and providing a sliding end plate, it is possible to prevent the support platform from moving synchronously with the support plates during the relative sliding of the two support plates.

[0019] Optionally, a pressure feedback component is further included, and the pressure feedback component includes: a pressure sensor, the pressure sensor being sandwiched between the first compression spring and any one of the end plates; and A display is communicatively connected with the pressure sensor to display the pressure value.

[0020] By adopting the above technical solution and observing the pressure value, personnel can easily distinguish the squeezing force of the upper die on the bracket original, thereby judging whether it is necessary to increase the distance between the two support plates to accommodate the outward expansion deformation of the bracket original within the allowable range.

[0021] Optionally, the pressure feedback component further includes: a processor, the processor being communicatively connected to the pressure sensor to receive pressure data from the pressure sensor; The processor is in communication connection with the linear drive member to drive the linear drive member to start and stop according to pressure data.

[0022] By adopting the above technical solution and setting a processor, it is convenient to automatically control the start and stop of the linear drive component, thereby improving the degree of automation.

[0023] Optionally, a traction assembly is further included, and each of the supporting inclined side plates is connected to the sliding bar through the traction assembly; the traction assembly includes: A second traction plate; A second compression spring, one end of the second compression spring is fixedly connected to the end of the sliding bar away from the support platform, and the other end is fixedly connected to the second traction plate. The second compression spring is always in a compressed state where deformation can be restored, and the second compression spring has a force that drives the second traction plate to press against the supporting inclined side plate.

[0024] By adopting the above technical solution and providing a traction assembly to pull the sliding bars on both sides of the support platform, the sliding of the support platform along the second direction Y can be reduced.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The instantaneous impact force is dissipated by the first compression spring, which reduces the damage to the original bracket and improves the quality of the original bracket; 2. By reserving a clearance gap, the outer flange can be accommodated, and when the outer flange contacts the supporting inclined side plate, the outer flange can be prevented from expanding and deforming during the bending process; 3. By setting a linear drive, the distance between the two supporting oblique side plates can be changed to adapt to different types of bracket components; in addition, by using the linear drive to increase the distance between the two supporting oblique side plates, the bracket component can be expanded within the allowable range during the bending process of the bracket component. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the original support component in the related technology of this application; Figure 2 It is a schematic diagram of the structure of the bracket original part and the upper die in the embodiment of the present application; Figure 3 It is a structural schematic diagram of the support member and the lower formwork in the embodiment of the present application; Figure 4 is a schematic diagram of the structure of the buffer assembly in an embodiment of the present application; Figure 5 It is a schematic diagram of the structure of the T-shaped block and the T-shaped slot in the embodiment of the present application; Figure 6 It is a schematic diagram of the structure of the upper die in the embodiment of the present application.

[0027] Explanation of the reference numerals in the accompanying drawings: 01, original bracket; 011, outer flange; 1, upper die; 11, die groove; 2, lower die; 3, support member; 31, support seat; 311, linear drive member; 312, support plate; 32, support oblique side plate; 321, workpiece placement area; 322, avoidance gap; 323, slide groove; 4, buffer assembly; 41, first telescopic rod; 42, first compression spring; 42, end plate; 42a, end plate one; 42b, end plate two; 421, T-block; 5, support platform; 51, sliding bar; 52, T-slot; 6, limit block; 7, traction assembly; 71, first traction plate; 72, second traction plate; 721, perforation; 73, second compression spring; 74, second telescopic rod; 75, ball; 8, pressure feedback assembly; 81, pressure sensor; 82, display; 83, processor. DETAILED DESCRIPTION

[0028] The following is combined with Figure 2-6 The present application is further described in detail. For the convenience of description, the present application introduces directional words such as a first direction X, a second direction Y, and a third direction Z to form a three-dimensional reference direction. The directional words used, such as "a first direction X, a second direction Y, and a third direction Z", can be specifically shown with reference to the figure, wherein X represents the first direction X, Y represents the second direction Y, and Z represents the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0029] The present application embodiment discloses a bending die for an automobile bracket. Figure 2 and Figure 3 The bending mold for the automobile bracket includes an upper pressing die 1, a lower supporting die 2, a support member 3 and a buffer assembly 4. The lower supporting die 2 is connected to the support member 3 through the buffer assembly 4 to buffer the impact force generated when the upper pressing die 1 presses the lower supporting die 2 along the first direction X; specifically, the support member 3 includes a support seat 31, one end of the buffer assembly 4 is connected to the support seat 31, and the other end is connected to the lower supporting die 2 to reduce the impact force on the lower supporting die 2.

[0030] Reference Figure 3In some embodiments of the present application, the support member 3 further includes two support oblique side plates 32, which are spaced apart in the second direction Y to limit the bracket original 01 in the second direction Y. The two support oblique side plates 32 form a workpiece placement area 321 for accommodating the lower formwork 2 in the second direction Y. The spacing between the two support oblique side plates 32 in the second direction Y gradually increases in the direction away from the support seat 31, so that the two support oblique side plates 32 form an inverted eight-shaped structure, and the support seat 31 is located at the smaller opening end of the inverted eight-shaped structure; During operation, the bracket component 01 is moved so that the opening of the bracket component 01 passes through the lower formwork 2, and then the bracket component 01 is overlapped on the lower formwork 2. In order to accommodate the outer flange 011 of the bracket component 01, in the second direction Y, an avoidance gap 322 is formed between a side wall of the supporting inclined side plate 32 close to the lower formwork 2 and the lower formwork 2 for accommodating the outer flange 011 of the bracket component 01.

[0031] Reference Figure 3 In order to support the outer flange 011, in some embodiments of the present application, a support platform 5 is further included. The support platform 5 is located on the side of the lower formwork 2 close to the support seat 31, and the support platform 5 is used to block the side of the avoidance gap 322 close to the support seat 31; the lower formwork 2 is detachably connected to the support platform 5, and when the bracket original 01 is overlapped with the lower formwork 2, the outer flange 011 of the bracket original 01 is located in the avoidance gap 322 and overlapped on the support platform 5, and the outer side of the outer flange 011 is in contact with the support inclined side plate 32; The support platform 5 can move synchronously with the lower formwork 2 in the first direction X for buffering. To this end, a slide groove 323 is opened on the support inclined side plate 32 along the plate thickness direction. The support platform 5 is fixedly connected with a sliding bar 51 on both sides of the third direction Z. The sliding bar 51 is passed through the slide groove 323 in the second direction Y, and the end of the sliding bar 51 away from the support platform 5 passes through the slide groove 323 and extends to the side of the two support inclined side plates 32 away from each other; the sliding bar 51 contacts the inner wall of the slide groove 323 so that the inner wall of the slide groove 323 guides the sliding of the sliding bar 51 along the first direction X.

[0032] Reference Figure 3In some embodiments of the present application, the support seat 31 includes a linear drive member 311 and two support plates 312. The driving direction of the linear drive member 311 is parallel to the second direction Y. In the present disclosure, the linear drive member 311 is a hydraulic cylinder; both ends of the linear drive member 311 are fixedly connected to a support plate 312, so that the two support plates 312 are pushed to move by the linear drive member 311, so that the two support plates 312 produce relative movement in the second direction Y; in the present disclosure, the two support plates 312 are spaced apart in the second direction Y, and a gap is formed between the two support plates 312 in the second direction Y for accommodating the linear drive member 311; in order to improve stability, a plurality of linear drives 311 are spaced apart in the third direction Z.

[0033] Reference Figure 4 and Figure 5 In the present disclosure, a buffer assembly 4 is provided between each support plate 312 and the support platform 5. The buffer assembly 4 includes a first telescopic rod 41 and a first compression spring 42. One end of the first telescopic rod 41 is directly or indirectly connected to the support plate 312, and the other end is directly or indirectly connected to the support platform 5; one end of the first compression spring 42 is directly or indirectly connected to the support plate 312, and the other end is directly or indirectly connected to the support platform 5; the telescopic direction of the first telescopic rod 41 and the telescopic direction of the first compression spring 42 are both parallel to the first direction X, so as to buffer the lower formwork 2 in the first direction X; In order to prevent the first compression spring 42 from deforming too much and causing the spring to fail, in some embodiments of the present application, a limit block 6 is further included. Each corresponding limit block 6 is detachably connected to each support oblique side plate 32. The limit block 6 is located on the side where the two support oblique side plates 32 are close to each other, and the limit block 6 is located on the side of the support platform 5 close to the support seat 31. When the support platform 5 is overlapped with the limit block 6, the first compression spring 42 is in a compressed state where the deformation can be restored. In some embodiments of the present application, the buffer assembly 4 further includes two end plates 42, which are spaced apart in the first direction X, and both ends of the first telescopic rod 41 are fixedly connected to one end plate 42, and both ends of the first compression spring 42 are fixedly connected to one end plate 42; Of the two end plates 42, one end plate 42 is end plate 1 42a, and the other end plate 42 is end plate 2 42b. One of the support platform 5 and the support plate 312 is connected to the end plate 1 42a in a sliding manner along the first direction X, and the other is connected to the end plate 2 42b in a fixed manner. In the present disclosure, the support platform 5 is connected to the end plate 1 42a in a sliding manner, and the support plate 312 is connected to the end plate 2 42b in a fixed manner. In order to enable the end plate 42a to slide along the support platform 5, in some embodiments of the present application, a T-shaped block 421 is fixedly connected to the side of the end plate 42a away from the end plate 42b, and a T-shaped slot 52 is opened along the second direction Y on the side of the support platform 5 close to the support plate 312. The T-shaped block 421 is adapted to the T-shaped slot 52 so that the T-shaped block 421 can slide in the T-shaped slot 52 along the second direction Y. By setting the T-shaped block 421 to slide along the T-shaped slot 52, when the two support plates 312 slide relative to each other, the support platform 5 can be prevented from sliding synchronously with the support plate 312.

[0034] Reference Figure 4 and Figure 5 In order to further prevent the support platform 5 from sliding with the support plate 312, in some embodiments of the present application, a traction assembly 7 is further included. The two sides of the two support inclined side plates 32 that are away from each other are each provided with a traction assembly 7, and each of the support inclined side plates 32 is connected to the sliding bar 51 through the traction assembly 7; the traction assembly 7 includes a first traction plate 71, a second traction plate 72, a second compression spring 73 and a second telescopic rod 74, the first traction plate 71 is fixedly connected to the end of the sliding bar 51 away from the support platform 5, and the second traction plate 72 is provided with a through hole 721, and the sliding bar 51 is penetrated by the through hole 721; One end of the second compression spring 73 is fixedly connected to the first traction plate 71, and the other end is fixedly connected to the second traction plate 72; one end of the second telescopic rod 74 is fixedly connected to the first traction plate 71, and the other end is fixedly connected to the second traction plate 72; the telescopic directions of the second telescopic rod 74 and the second compression spring 73 are parallel to the second direction Y; within the travel range of the sliding bar 51 in the sliding groove 323, the second compression spring 73 is always in a recoverable compression deformation state, and the second traction plate 72 is always pressed against the supporting inclined side plate 32 under the push of the second compression spring 73; under the balance of the second compression springs 73 on both sides, the movement of the support platform 5 in the second direction Y can be reduced as much as possible; In order to improve the smoothness of the sliding of the second traction plate 72 compared to the supporting inclined side plate 32, in some embodiments of the present application, the traction assembly 7 also includes a plurality of balls 75, which are embedded in the wall of the second traction plate 72 away from the first traction plate 71 and can rotate freely along the second traction plate 72. The balls 75 are in contact with the supporting inclined side plate 32, so that the sliding process of the second traction plate 72 along the supporting inclined side plate 32 is smoother.

[0035] Reference Figure 4 and Figure 5In some embodiments of the present application, a pressure feedback component 8 is also included. The pressure feedback component 8 includes a pressure sensor 81, a display 82 and a processor 83. The pressure sensor 81 is fixedly connected between the first compression spring 42 and the end plate 42b. The processor 83 is communicated with the pressure sensor 81 to receive the pressure signal of the pressure sensor 81. The display 82 and the linear drive member 311 are both communicated with the processor 83 so that the pressure value is displayed by the display 82, and the processor 83 controls the start and stop of the linear drive member 311 according to the pressure signal. In the present disclosure, the processor 83 and the display 82 are both embedded in the supporting inclined side plate 32.

[0036] Reference Figure 6 During operation, the upper pressing die 1 is moved along the first direction X toward the side of the lower supporting die 2 to press the two ends of the bracket original component 01 overlapped on the lower supporting die 2 downward; regarding the upper pressing die 1, the upper pressing die 1 is located on the side of the lower supporting die 2 away from the support seat 31, and the side of the upper pressing die 1 close to the lower supporting die 2 is provided with a pressing groove 11 for accommodating the lower supporting die 2, and the groove wall of the pressing groove 11 is adapted to the shape of the bracket original component 01 after being bent, so that when the upper pressing die 1 approaches the lower supporting die 2, the groove wall of the pressing groove 11 bends the bracket original component 01 to the required angle.

[0037] The implementation principle of the bending mold for an automobile bracket in the embodiment of the present application is: when in use, the bracket original part 01 is overlapped on the lower supporting mold 2, and then the upper pressing mold 1 is moved toward the side of the lower supporting mold 2, so that the bracket original part 01 can be bent into a desired shape.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bending die for an automobile bracket, characterized in that: include: Lower formwork (2); An upper pressing die (1), wherein a pressing groove (11) for inserting the lower supporting die (2) is formed on a side of the upper pressing die (1) close to the lower supporting die (2); A support member (3) having a support seat (31), wherein the support seat (31) is located on a side of the lower support die (2) away from the upper die (1); as well as A buffer assembly (4), the buffer assembly (4) comprising a first telescopic rod (41) and a first compression spring (42); one end of the first telescopic rod (41) is connected to the lower support mold (2), and the other end is connected to the support seat (31); one end of the first compression spring (42) is connected to the lower support mold (2), and the other end is connected to the support seat (31); the telescopic direction of the first telescopic rod (41) and the telescopic direction of the first compression spring (42) are both parallel to the first direction X; The upper pressing die (1), the lower supporting die (2) and the supporting seat (31) are distributed in sequence in the first direction X.

2. A bending die for an automobile bracket according to claim 1, characterized in that: The support member (3) further comprises two supporting inclined side plates (32) fixedly connected to the support member (3); The two supporting inclined side plates (32) are spaced apart in the second direction Y, so that the two supporting inclined side plates (32) form a workpiece placement area (321) for accommodating the lower formwork (2) in the second direction Y; The distance between the two supporting inclined side plates (32) in the second direction Y gradually increases toward the side away from the supporting seat (31); In the second direction Y, an avoidance gap (322) is formed between the side of the supporting inclined side plate (32) close to the lower supporting formwork (2) and the lower supporting formwork (2), and the avoidance gap (322) is used to accommodate the outer flange (011) of the bracket original component (01).

3. A bending die for an automobile bracket according to claim 2, characterized in that: Also includes a support platform (5); The support platform (5) is slidably connected to the support inclined side plate (32) along a first direction X; The lower support formwork (2) is located on a side of the support platform (5) away from the support seat (31), and the lower support formwork (2) is detachably connected to the support platform (5); The supporting inclined side plate (32) is used to block the side of the avoidance gap (322) close to the supporting seat (31), so that the supporting platform (5) is used to overlap the outer flange (011) of the bracket original component (01); The buffer assembly (4) is connected between the support platform (5) and the support seat (31).

4. A bending die for an automobile bracket according to claim 3, characterized in that: A side of each of the supporting inclined side plates (32) close to another of the supporting inclined side plates (32) can be detachably connected to a limiting block (6); The limit block (6) is located on a side of the support platform (5) close to the support seat (31); when the support platform (5) contacts the limit block (6), the first compression spring (42) is in a compressed state in which deformation can be restored.

5. The bending die for automobile bracket according to claim 4, characterized in that: The supporting inclined side plate (32) is provided with a sliding groove (323) extending through it along the second direction Y, and the supporting platform (5) is fixedly connected with a sliding bar (51) extending through the sliding groove (323), and the groove wall of the sliding groove (323) is used to guide the sliding bar (51) to slide along the first direction X.

6. The bending die for automobile bracket according to claim 5, characterized in that: The support seat (31) comprises: A linear driving member (311), wherein the driving direction of the linear driving member (311) is parallel to the second direction Y; and two support plates (312), wherein both ends of the linear drive member (311) are respectively connected to one of the support plates (312), so that the two support plates (312) can move relative to each other in the second direction Y; Each of the supporting inclined side plates (32) is fixedly connected to one of the supporting plates (312).

7. A bending die for an automobile bracket according to claim 6, characterized in that: The buffer component (4) further comprises: Two end plates (42), the two end plates (42) are spaced apart in a first direction X, the first compression spring (42) and the first telescopic rod (41) are both fixedly connected between the two end plates (42); one of the two end plates (42) is end plate one (42a), and the other is end plate two (42b); One of the support platform (5) and the support plate (312) is slidably connected to the end plate 1 (42a) along the first direction X, and the other is fixedly connected to the end plate 2 (42b).

8. The bending die for automobile bracket according to claim 7, characterized in that: It also includes a pressure feedback component (8), wherein the pressure feedback component (8) includes: a pressure sensor (81), the pressure sensor (81) being sandwiched between the first compression spring (42) and any one of the end plates (42); and A display (82), the display (82) is communicatively connected to the pressure sensor (81) for displaying the pressure value.

9. The bending die for automobile bracket according to claim 8, characterized in that: The pressure feedback component (8) further comprises: a processor (83), the processor (83) being communicatively connected to the pressure sensor (81) to receive pressure data from the pressure sensor (81); The processor (83) is in communication connection with the linear drive member (311) so as to drive the linear drive member (311) to start and stop according to the pressure data.

10. A bending die for an automobile bracket according to any one of claims 7 to 9, characterized in that: It also includes a traction assembly (7), and each of the supporting inclined side plates (32) is connected to the sliding bar (51) through the traction assembly (7); the traction assembly (7) includes: A second traction plate (72); A second compression spring (73), one end of the second compression spring (73) is fixedly connected to one end of the sliding bar (51) away from the supporting platform (5), and the other end is fixedly connected to the second traction plate (72), the second compression spring (73) is always in a compressed state in which deformation can be restored, and the second compression spring (73) has a force that drives the second traction plate (72) to press against the supporting inclined side plate (32).

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